I read about MCE in Yule’s The Study of Language and it raised my curiosity on how different MCE is from ASL.
American Sign Language, like all sign languages, is a fully fledged natural human language. It is not some form of American English.
Manually Coded English uses the signs from ASL to communicate the English language. It could be considered a kind of relexification, as well as a pidgin. In practice it has as much similarity to ASL as if someone replaced every English word with one from Chinese.